Problem Switching from OUTLOOK to Thunderbird
How do I import my "Sent" emails from 2010 OUTLOOK into Thunderbird?
How do I import my "Sent" emails from 2010 OUTLOOK into Thunderbird?
Opaite Mbohovái (1)
To my knowledge, you need to use PST file, which is not simple. This is a long thread, but I think it will give you the necessary info: https://support.mozilla.org/en-US/questions/1413379